Summary: I bought a TDP-PX10U data projector and I have not used it until recently. The projector is very light and compact. It is also easy to use. However, I am extremely disappointed with the level of noise that emits from this projector when it is turned on. I am using it to teach my classes and the noise level is so high it is not useful. It sounds like 'a motor boat' when it is turned on and the noise continues until it is turned off. I believe I bought a lemon.